Then that's confirming my guess that the loss of function is due to the model change from 3790 to 37xx. The device is now performing like the very basic junior model 3700, no ASR etc., so you have the same symptoms as described here: [Only registered and activated users can see links. ].

The best solution if it works is to convert to 3490 in the hope that the device's PCB version doesn't cause accuracy problems and the jumping vehicle symbol, which is exactly what you've found yours does. Therefore you have one of the boards that doesn't play well converting to 3490.

If you convert it back it will not have the inaccuracy and jumping car but will still suffer the function losses consistent with the model change to 37xx. So, after re-converting you could take the (somewhat risky) path of erasing the nonvol memory (ergn,41) which might restore the functionality but make sure you have a good backup of rgn41 after reconverting in case it goes badly. The other thing you could try is converting it back using V4.9 or earlier firmware then applying [Only registered and activated users can see links. ] but that's a guess because i've never tried it on a 37x0 suffering model loss. TuboCCC's patch is reported not to work with V5 or later fw.